diff --git a/system/src/Grav/Common/Data/Validation.php b/system/src/Grav/Common/Data/Validation.php
index 08e2e3ac9..f37958108 100644
--- a/system/src/Grav/Common/Data/Validation.php
+++ b/system/src/Grav/Common/Data/Validation.php
@@ -208,6 +208,17 @@ class Validation
         return \is_array($value) ? true : self::typeText($value, $params, $field);
     }
 
+    /**
+     * @param mixed $value
+     * @param array $params
+     * @param array $field
+     * @return array|array[]|false|string[]
+     */
+    protected static function filterLines($value, array $params, array $field)
+    {
+        return \is_array($value) ? $value : preg_split('/\s*[\r\n]+\s*/', $value, -1, PREG_SPLIT_NO_EMPTY);
+    }
+
     /**
      * @param mixed $value
      * @param array $params